package com.liuduidui.sh.service;

import com.alibaba.fastjson.JSON;
import com.liuduidui.sh.pojo.Content;
import com.liuduidui.sh.utils.UtilOfKeyWord;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @program: es7-mo
 * @description: 业务层
 * @author: WEN
 * @create: 2020-07-25
 **/
@Service
public class ContentService {


    @Autowired
    private RestHighLevelClient restHighLevelClient;

    public Boolean parseContent(String keywords) throws Exception{
        List<Content> contents = UtilOfKeyWord.parseJD(keywords);

        //将查询到的数据放入es中
        BulkRequest bulkRequest = new BulkRequest();
        //超时时间2分钟
        bulkRequest.timeout("2m");
        for (Content ct :contents){
            bulkRequest.add(
                    new IndexRequest("jd_goods")
                            .source(JSON.toJSONString(ct), XContentType.JSON));
        }
        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        return !bulk.hasFailures();
    }

    public List<Map<String, Object>> searchPage(String keyword, int pageNo, int pageSize) throws Exception {
        if(pageNo <=1){
            pageNo =1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //设置分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);


        //精确匹配
        TermQueryBuilder termQueryBuilder= QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");//设置标题高亮
        highlightBuilder.requireFieldMatch(false);//关闭多个高亮显示
        highlightBuilder.preTags("<span style ='color:red;font-weight: bold'>"); //设置标签头
        highlightBuilder.postTags("</span>"); //设置标签尾
        sourceBuilder.highlighter(highlightBuilder);

        //执行搜索
        searchRequest.source(sourceBuilder);

        SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);


        //解析结果
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for ( SearchHit documentFields: search.getHits().getHits()){
            Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();//获取原来的结果
            //解析高亮的字段,将原来的字段换为高亮字段即可

            if(title != null){
                org.elasticsearch.common.text.Text[] fragments = title.fragments();
                String n_title="";
                for ( Text text: fragments) {//获取高亮的字段
                    n_title+=text;
                }
                sourceAsMap.put("title",n_title);//高亮字段替换为原来内容即可
            }
            list.add(sourceAsMap);
        }
        return list;
    }
}